3. EZR32WG Radio Board block description

The block diagram of the EZR32WG Radio Board is shown in the figure below.

Board

Identification

Power

Domain

Backup

Capacitor

LF Crystal

(32.768 kHz)

RF Crystal

(30 MHz)

(48 MHz)

HF Crystal

USB_VBUS

USB_VREGI

USB_VREGO

VMCU

VRF

PA

PB

PC

PD

PE

PF

XIN/XOUT

TX_20

RXN/RXP

Matching

Network

SMA

Connector

MCU

I/O

Ports

USB_D+/D-

USB_VBUS (5 V)

USB Micro-B

Connector

USB Regulator Output (3.3 V)

to WSTK Motherboard

Power Supply (3.3 V)

from WSTK Motherboard

EZRWG330

MCU

RADIO

GPIO2/3

RF Switch Control

Switched RF

Figure 3.1. EZR32WG Radio Board block diagram

3.1 USB

The EZR32WG Radio Board incorporates a micro USB connector (P/N: ZX62-B-5PA(11)). The 3.3V USB regulator output is are routed

back to the WSTK through the Radio Board Connector so the Radio Board can supply power to the Wireless Starter Kit Mainboard.

For additional information on EZR32WG USB, refer to the EZR32WG330 Data Sheet.

3.2 RF Crystal Oscillator

The BRD4503B (Rev. A00) Radio Board has a 30 MHz crystal mounted (P/N: NX2016SA 30 MHz EXS00A-CS06568). For more details

on crystal or TCXO selection for the RF part of the EZR32 devices refer to "AN785: Crystal Selection Guide for the Si4x6x RF ICs".

3.3 LF Crystal Oscillator (LFXO)

The BRD4503B (Rev. A00) Radio Board has a 32.768kHz crystal mounted (P/N: MS3V-T1R, 32768Hz, 12.5pF, +/- 20ppm). For safe

startup two 22 pF capacitors are also connected to the LFXTAL_N and LFXTAL_H pins. For details regarding the crystal configuration,

the reader is referred to Application Note "AN0016: EFM32 Oscillator Design Consideration".

3.4 HF Crystal Oscillator (HFXO)

The BRD4503B (Rev. A00) Radio Board has a 48 MHz crystal mounted (P/N: ABM11-48.000MHZ-D2X-T3). For safe startup two 10 pF

capacitors are also connected to the HFXTAL_N and HFXTAL_H pins. For details regarding the crystal configuration, the reader is re-

ferred to Application Note "AN0016: EFM32 Oscillator Design Consideration".

3.5 Backup Power Domain Capacitor

The BRD4503B (Rev. A00) Radio Board has a 30 mF super capacitor mounted (P/N: PAS311HR-VA6R), connected to the PD8 port of

the EZR32WG.

For details regarding the Backup Power Domain, the reader is referred to the EZR32WG330 Data Sheet.

BRD4503B (Rev. A00)

EZR32WG Radio Board block description

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